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Wong’s contribution in the qualitative theory of second-order differential equations is well-known to a large mathematical auidence. Among a huge number of published Wong’s papers, in this survey article, we analyze only a fewWong’s theorems including their consequences, examples and many influences to other mathematicians dealing with oscillations of second-order differential and functional differential equations as well as of corresponding dynamic equations on time scales.

Second-order differential equations: some significant results due to James S.W. Wong